Construction and installation of hexagonal wooden cages for fish farming: A technical manual

FAO Fisheries and Aquaculture Technical Paper No. 576

Construction and installation of hexagonal wooden cages for fish farming
A technical manual

Fabrizio Piccolotti
FAO Consultant
Rome, Italy


Alessandro Lovatelli
Aquaculture Officer
Aquaculture Branch
FAO Fisheries and Aquaculture Department
Rome, Italy

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Food and Agriculture Organization of the United Nations
Rome, 2013


Piccolotti, F. & Lovatelli, A. 2013.
Construction and installation of hexagonal wooden cages for fish farming: A technical manual
FAO Fisheries and Aquaculture Technical Paper. No. 576. Rome, FAO. 76 pp.

This document is a practical guide that provides a list and technical details of the materials to be used for constructing a hexagonal wooden cage, together with its mooring system, for fish farming within the framework of artisanal aquaculture. The instructions for assembling the different components are illustrated in detail, and the technical guidelines for cage installation at the farming site are also described. The basic knowledge and instructions provided in this manual are intended for those working in aquaculture development.


Preparation of this document

1 –


2 –

Selection of site and suitable species



Site selection


Environmental aspects


Hydrodynamic and geological factors


Physicochemical, ecological and biological factors


Logistical and sociocultural factors



Selection of suitable species


Economic aspects


Physiological aspects


Technical aspects

3 –

Choice of cage model



Basic criteria


Economic factors: cost and benefit analysis


Technical factors


Components of a hexagonal wooden cage



Cage model


The frame


The flotation system


The mooring system


The net


Cage construction



Preparation of the mooring posts



Fixing of the wooden structure



Preparation of the flotation system


Cage installation at the farming site



Marking of mooring points



Preparation of mooring lines



Installation of mooring posts and mooring of the cage



Attachment of the net

References and suggested reading




Calculation of the surface area, volume and buoyancy of a body






Composition of concrete



Technical characteristics of ropes



Calculation of location of the mooring posts

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The views expressed in this information product are those of the author(s) and do not necessarily reflect the views or policies of FAO.

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